Therma

A node.js app that acts as local print server for an Epson thermal receipt printer.

Details

This app is accessible via the local network.

This app converts the request url into a print command.

I've successfully hosted this app on a Raspberry Pi.

This app uses the node-thermal-printer module.

How this node.js app is organized:

• The app.js file contains the server object and acts as the main operator. The check.js file is used to ensure that the printer is available. It contains and error and timeout listeners. (The NTP module's error functionality doesn't handle errors when connecting to the printer over the network.)

• The format.js file handles parsing and formatting the print data. I've included the following style options: Bold, BlackBackground, Small, Medium and Large. Options can be combined.

• The print.js file creates the printer object and issues the print command. If a quantity isn't included in the url, nothing prints (by design). I’ve chosen the paper cutting default to be partialCut();. This can be switched to cut();.

• The url is formatted as follows: http://raspi.local:7777/?printerIP=&quantity=&data1=&options1=&data2=&options2=&data3=&options3=&data4=&options4=